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Oxidation of Phenols to Quinones01:17

Oxidation of Phenols to Quinones

In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox property is crucial in...

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Related Experiment Video

Updated: Jul 1, 2026

Microwave-Assisted Extraction of Phenolic Compounds and Antioxidants for Cosmetic Applications Using Polyol-Based Technology
07:05

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Synthesis, characterization and antioxidant activity copper-quercetin complex.

S Birjees Bukhari1, Shahabuddin Memon, M Mahroof-Tahir

  • 1Free Radical Research Laboratory, National Center of Excellence in Analytical Chemistry, University of Sindh, Jamshoro 76080, Pakistan. birjees_bukahri2k4@yahoo.com

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|September 12, 2008
PubMed
Summary

Quercetin, a dietary flavonoid, forms a complex with copper (Cu(II)) ions. This new complex exhibits significantly enhanced antioxidant activity compared to quercetin alone, offering potential health benefits.

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Area of Science:

  • Biochemistry
  • Coordination Chemistry
  • Nutritional Science

Background:

  • Quercetin is a prevalent dietary flavonoid with known biological properties.
  • Flavonoids can interact with metal ions, potentially altering their activity.
  • Copper (Cu(II)) is an essential trace element involved in various biological processes.

Purpose of the Study:

  • To investigate the interaction between quercetin and Cu(II) ions in methanol.
  • To characterize the resulting metal-flavonoid complex.
  • To evaluate the antioxidant potential of the complexed flavonoid.

Main Methods:

  • Spectroscopic techniques including UV-vis, 1H NMR, and IR spectroscopy were employed.
  • Job's method of continuous variation was used to determine the stoichiometric ratio.
  • Antioxidant activity was assessed using the 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging assay.

Main Results:

  • Spectroscopic data confirmed the interaction and chelation sites between quercetin and Cu(II).
  • Job's method indicated a 1:2 (ligand:metal) stoichiometry for the complex.
  • The quercetin-Cu(II) complex demonstrated significantly higher free radical scavenging activity than free quercetin.

Conclusions:

  • Quercetin forms a stable 1:2 complex with Cu(II) ions in methanol.
  • Complexation with Cu(II) enhances the antioxidant capacity of quercetin.
  • The findings suggest potential applications of quercetin-metal complexes in combating oxidative stress.